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Low voltage direct current breaker

A low-voltage DC and circuit breaker technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of contact ablation, the large volume of the arc extinguishing chamber, and the inability to meet the breaking requirements of low-voltage DC current, and achieve the Long contact life and small size

Pending Publication Date: 2018-10-26
HENAN SENYUAN ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a low-voltage DC circuit breaker, which is used to solve the problem that the DC circuit breaker in the rail transit system requires a large volume of the arc extinguishing chamber and serious contact ablation, which cannot meet the low-voltage DC current breaking requirements.

Method used

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Embodiment Construction

[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] The invention provides a low-voltage direct current circuit breaker, the schematic diagram of its circuit structure is as follows figure 1 As shown, it includes the flow branch, the commutation branch and the dissipation branch connected in parallel. Among them, a circuit breaker contact is arranged in series in the flow branch, and a commutation control switch T is arranged in series in the commutation branch. 1 And capacitance C, the arrester is arranged in series in the dissipative branch.

[0019] Wherein, in this embodiment, since the cut-off current is relatively small, the circuit breaker contacts arranged in series in the flow branch are MCB miniature circuit breakers, and the MCB miniature circuit breakers include an opera...

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Abstract

The invention relates to a low voltage direct current breaker. The low voltage direct current breaker comprises a current conveyance branch, a conversion branch and a dissipation branch, which are connected in parallel, wherein a breaker contact is arranged in the current conveyance branch in series, a conversion control switch and a capacitor are arranged in the conversion branch in series, and alightning arrester is arranged in the dissipation branch in series. For the low voltage direct current breaker provided by the invention, an arc extinguishing mode of the low voltage direct current breaker is changed, and the breaker contact with relatively lower voltage level is arranged in the current conveyance branch in series, thus, low voltage with relatively higher level can be cut off, and the low voltage direct current breaker has the advantages of small size of an arc extinguishing chamber, long service life of contacts of contact terminals, and so on, and can satisfy requirements of switching on and switching off low voltage direct current under different work environments.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a low-voltage direct current circuit breaker. Background technique [0002] The power supply system of rail transit includes high, medium and low voltage AC power supply system, DC power supply system and centralized power monitoring system (SCADA). The electrical equipment in the DC power supply system includes rectifiers, DC fast circuit breakers, DC switchgear, etc. Among them, the DC switchgear is one of the core equipment of the rail transit power supply system, and the DC circuit breaker in the DC switchgear plays a role in the DC switchgear. to a vital role. [0003] At present, there are three main types of technical solutions for DC circuit breakers, namely traditional mechanical DC circuit breakers based on conventional switches, solid-state DC circuit breakers based on pure power electronic devices, and hybrid DC circuit breakers based on the combination of the two. Among them, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22
CPCH02H7/22
Inventor 张营奎裴亚迪张瑞瑞
Owner HENAN SENYUAN ELECTRIC CO LTD
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